{"id":30674,"date":"2019-10-31T21:36:50","date_gmt":"2019-10-31T18:36:50","guid":{"rendered":"https:\/\/prohoster.info\/blog\/50-letnij-modem-vzglyad-iznutri\/"},"modified":"2019-10-31T21:36:50","modified_gmt":"2019-10-31T18:36:50","slug":"50-letnij-modem-vzglyad-iznutri","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/50-letnij-modem-vzglyad-iznutri","title":{"rendered":"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/ebe0f3e7fc52d9578faea3191d415e43.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPred nieko\u013ek\u00fdmi rokmi autor nav\u0161t\u00edvil ble\u0161\u00e1k, ktor\u00fd organizoval W6TRW na parkovisku spolo\u010dnosti Northrop Grumman v Redondo Beach v Kalifornii. Medzi telev\u00edzormi pripom\u00ednaj\u00facimi biele medvede a mno\u017estvom nab\u00edja\u010diek na telef\u00f3ny a nap\u00e1jac\u00edch zdrojov sa objavil dreven\u00fd box so z\u00e1mkom, drevenou rukov\u00e4\u0165ou a konektorom DB-25 na boku. Ved\u013ea konektora bol prep\u00edna\u010d: poloduplex \u2013 pln\u00fd duplex. Autor hne\u010f vedel, \u010do je to. Modem. Dreven\u00fd modem. Konkr\u00e9tne \u2013 modem s akustick\u00fdm p\u00e1rovan\u00edm, ktor\u00fd vydala spolo\u010dnos\u0165 Livermore Data Systems pribli\u017ene v roku 1965.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/ef0c11dfbcadf7b80f216afd7d19e6ee.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Modem je zatia\u013e na ble\u0161\u00e1ku. Hne\u010f po odfotografovan\u00ed ho autor k\u00fapil za 20 dol\u00e1rov.<\/i><\/p>\n<p>Preto\u017ee nie v\u0161etci vedia, \u010do je modem s akustick\u00fdm p\u00e1rovan\u00edm \u2014 mal\u00fd \u00favod do hist\u00f3rie. Probl\u00e9m bol v tom, \u017ee kedysi nepatrili telefonn\u00fdm spolo\u010dnostiam iba linky. Muselo sa prenaj\u00edma\u0165 aj telef\u00f3nne pr\u00edstroje. T\u00ed \u010ditatelia, ktor\u00ed za\u017eili dial-up, pripojili modemy priamo k telefonn\u00fdm link\u00e1m. A v \u010dase, ke\u010f bol tento modem vyroben\u00fd, to bolo zak\u00e1zan\u00e9. Pod\u013ea americk\u00e9ho z\u00e1kona z roku 1934 bolo pripojenie \u010dohoko\u013evek k dom\u00e1cemu telef\u00f3nu zak\u00e1zan\u00e9 ak\u00fdmiko\u013evek sp\u00f4sobmi. V roku 1956 po pr\u00edpade Hush-A-Phone Corp v. United States bolo pravidlo zmiernen\u00e9: <i>mechanicky<\/i> pripoji\u0165 sa za\u010dalo da\u0165. Hush-A-Phone \u2013 to je <noindex><a rel=\"nofollow\" href=\"https:\/\/en.m.wikipedia.org\/wiki\/Hush-A-Phone\">to je<\/a><\/noindex>.<\/p>\n<p>Form\u00e1lne sa r\u00f4znym zariadeniam elektricky umo\u017enilo pripojenie k telefonnej linke v USA v roku 1968 (<noindex><a rel=\"nofollow\" href=\"https:\/\/web.archive.org\/web\/20150120021035\/http:\/\/www.uiowa.edu\/~cyberlaw\/FCCOps\/1968\/13F2-420.html\">rozhodnutie Carterphone<\/a><\/noindex>). Ale a\u017e do roku 1978 nebolo mo\u017en\u00e9 t\u00fato mo\u017enos\u0165 vyu\u017ei\u0165, preto\u017ee neboli vypracovan\u00e9 tarify, \u0161pecifik\u00e1cie a met\u00f3dy certifik\u00e1cie. Preto od roku 1956 do 1978 malo zmysel pou\u017e\u00edva\u0165 akusticky p\u00e1rovan\u00e9 modemy a automatick\u00e9 z\u00e1znamn\u00edky. V praxi ich vyr\u00e1bali dlh\u0161ie \u2014 z inertnosti.<\/p>\n<p>Tento modem, kter\u00fd pr\u00e1v\u011b le\u017e\u00ed na stole autora, je neodd\u011blitelnou, ale neobvyklou str\u00e1nkou historie. Byl vyroben p\u0159ed rozhodnut\u00edm Carterphone, a proto se nem\u016f\u017ee p\u0159ipojit p\u0159\u00edmo k telefonn\u00ed s\u00edti. Byl navr\u017een p\u0159ed v\u00fdvojem mnoha \u010dip\u016f, kter\u00e9 dnes pova\u017eujeme za klasick\u00e9. Prvn\u00ed verze tohoto modemu byla vyd\u00e1na pouh\u00fd rok po Bell 103, prvn\u00edm komer\u010dn\u011b \u00fasp\u011b\u0161n\u00e9m modemu. P\u0159ed v\u00e1mi je skv\u011bl\u00fd p\u0159\u00edklad toho, kolik mo\u017enost\u00ed lze \u201evyt\u011b\u017eit\u201c pouze z t\u0159in\u00e1cti tranzistor\u016f. Tento modem byl pot\u00e9 dlouho zapomenut, dokud nebyly nato\u010deny dva videa, jedno v roce 2009 a druh\u00e9 v roce 2011:<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"X9dpXHnJXaE\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/X9dpXHnJXaE\/hqdefault.jpg\" alt=\"Prehrajte video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"RxM_0BguTkE\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/RxM_0BguTkE\/hqdefault.jpg\" alt=\"Prehrajte video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>Video bloger phreakmonkey sehnal ran\u00fd exempl\u00e1\u0159 modemu s v\u00fdrobn\u00edm \u010d\u00edslem t\u011bsn\u011b nad 200. Takov\u00e9 modemy se vyzna\u010duj\u00ed sk\u0159\u00edn\u011bmi z o\u0159echov\u00e9ho d\u0159eva, jejich\u017e \u010d\u00e1sti jsou spojeny \u201evla\u0161tov\u010d\u00edmi ocasy\u201c. Podle phreakmonkeyho lze podle t\u00e9to charakteristiky ur\u010dit, jak je modem star\u00fd, proto\u017ee \u201evla\u0161tov\u010d\u00ed ocasy\u201c jsou pracn\u00e9 na v\u00fdrobu. Od v\u00fdrobn\u00edho \u010d\u00edsla 850 se modemy za\u010daly umis\u0165ovat do sk\u0159\u00edn\u011bk z teakov\u00e9ho d\u0159eva se spojen\u00edmi ve tvaru krabice. Pot\u00e9 se \u010d\u00e1sti pouzdra za\u010daly spojovat perem. Spole\u010dnosti Livermore Data Systems bylo t\u0159eba vyr\u00e1b\u011bt modemy st\u00e1le rychleji.<\/p>\n<p>V roce 2007 bloger Brent Hilpert nahl\u00e9dl do takov\u00e9ho modemu a <noindex><a rel=\"nofollow\" href=\"http:\/\/madrona.ca\/e\/LDSA\/index.html\">popisoval jeho konstrukci<\/a><\/noindex>. Zvl\u00e1\u0161\u0165 zaj\u00edmav\u00e9 je jeho sch\u00e9ma. V\u0161echny t\u0159i tranzistory v modemu jsou standardn\u00ed a v t\u00e9 dob\u011b \u0161iroce roz\u0161\u00ed\u0159en\u00e9. Jeden germaniov\u00fd PNP tranzistor je pou\u017eit z d\u016fvodu, kter\u00fd autorovi nen\u00ed jasn\u00fd. Tranzistory v\u0161ech t\u011bchto typ\u016f je i dnes snadn\u00e9 naj\u00edt ve star\u00fdch z\u00e1sob\u00e1ch. Celkem asi dvacet dolar\u016f \u2013 a m\u00e1te v rukou \u00faplnou sadu tranzistor\u016f pot\u0159ebn\u00fdch k reprodukci toto\u017en\u00e9ho modemu. Pravda, budou pot\u0159eba i dal\u0161\u00ed sou\u010d\u00e1sti, v\u010detn\u011b miniaturizovan\u00fdch transform\u00e1tor\u016f.<\/p>\n<p><img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/8bc0100ce71bb732af468a869054f02d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSkute\u010dn\u00e9 za\u0159\u00edzen\u00ed akustick\u00e9ho spojen\u00ed modemu n\u011bkdo vyjmul, zbytek je zcela v souladu s dokumentac\u00ed. Na plo\u0161n\u00fdch spoj\u00edch jsou um\u00edst\u011bny t\u0159i desky. Na prvn\u00ed jsou v\u0161echny sou\u010d\u00e1sti nap\u00e1jec\u00edho zdroje krom\u011b transform\u00e1toru, na druh\u00e9 je modul\u00e1tor a na t\u0159et\u00ed demodul\u00e1tor. Na tranzistorech 2N5138 je uvedeno datum: 37. t\u00fdden 1969. P\u0159esn\u011bji ur\u010dit datum v\u00fdroby samotn\u00e9ho modemu se nepoda\u0159ilo, ale pravd\u011bpodobn\u011b byl vyroben a odesl\u00e1n p\u0159ed rokem 1970.<\/p>\n<p><img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/1dfcc6ad00a1eaf1ab4c35ec88622018.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/53f2d99ad32bba9813e13a4207307476.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Spojen\u00ed perem znamen\u00e1, \u017ee modem je pozdn\u00ed v\u00fdroby<\/i><\/p>\n<p><img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/e7a8be9ceaa9ddc2f7b021fd05e2f84c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/2d925175f842b4baa1b3d1a8be895bec.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/b7f1a9ff985722ee6f6feeee9ff4147d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/756c479bd23de0e5953b30ecf415f4e0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-ro\u010dn\u00fd modem: poh\u013ead z vn\u00fatra\" src=\"\/wp-content\/uploads\/2019\/04\/4c67ff1fbae36ffe2b38e47ed8ea558b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAutor si zak\u00fapil tento modem len aby ho mal pri sebe. Je to dreven\u00fd modem, ale sotva si niekto z autorov\u00fdch zn\u00e1mych dok\u00e1\u017ee predstavi\u0165, ak\u00fd je skvel\u00fd. Ide o umeleck\u00e9 dielo, v ktorom je to\u013eko nezvy\u010dajn\u00e9ho. Autor chcel modem opravi\u0165, no uvedomil si, \u017ee je to nepraktick\u00e9.<\/p>\n<p>Po prv\u00e9, bude potrebn\u00e9 n\u00e1js\u0165 origin\u00e1lne zariadenie akustick\u00e9ho prepojenia. Kv\u00f4li jeho absencii n\u00e1v\u0161tevn\u00edci ble\u0161\u00edch trhov nerozumeli tomu, \u010do maj\u00fa pred sebou. Embl\u00e9m Livermore Data Systems a s\u00e9riov\u00e9 \u010d\u00edslo boli p\u00f4vodne na tomto zariaden\u00ed, a ich absencia iba s\u0165a\u017eovala rozpoznanie produktu ako modemu in\u00fdmi n\u00e1v\u0161tevn\u00edkmi, preto\u017ee nie s\u00fa zamestnancami po\u010d\u00edta\u010dov\u00fdch m\u00faze\u00ed. Samozrejme, l\u00e1kav\u00e9 by bolo vytla\u010di\u0165 detaily akustick\u00e9ho prepojenia, no dostan\u00fa sa k tomu?<\/p>\n<p>Po druh\u00e9, ur\u010dite \u201eutiekli\u201c parametre mnoh\u00fdch kondenz\u00e1torov. Samozrejme, zauj\u00edmav\u00e9 by bolo prebra\u0165 v\u0161etky dosky, ale ak chce autor z\u00edska\u0165 funguj\u00faci modem s akustick\u00fdm prepojen\u00edm, existuje lep\u0161ia mo\u017enos\u0165.<\/p>\n<p>\u0420\u0435\u0447\u044c \u0438\u0434\u0451\u0442 \u043e\u0431 \u043e\u0441\u0442\u0440\u043e\u0443\u043c\u043d\u043e\u0439 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 \u043f\u043e\u0434 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/de.wikipedia.org\/wiki\/Datenklo\">toaleta pre d\u00e1ta<\/a><\/noindex>&#171;, \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u043e\u0439 Chaos Computer Club \u0430 1985 \u0433\u043e\u0434\u0443 \u0432 \u043e\u0442\u0432\u0435\u0442 \u043d\u0430 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0439 \u0437\u0430\u043f\u0440\u0435\u0442, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0442\u043e\u0433\u0434\u0430 \u0432 \u0424\u0420\u0413 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u043b \u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c. \u0423\u0441\u0442\u0440\u043e\u0435\u043d \u0442\u0430\u043a\u043e\u0439 \u043c\u043e\u0434\u0435\u043c \u043f\u0440\u043e\u0449\u0435, \u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 \u0443 \u043d\u0435\u0433\u043e \u0431\u043e\u043b\u044c\u0448\u0435. \u041e\u043d \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d \u043d\u0430 \u043c\u0438\u043a\u0440\u043e\u0441\u0445\u0435\u043c\u0435 AM7910, \u0432\u0441\u0451 \u0435\u0449\u0451 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u044e\u0449\u0435\u0439\u0441\u044f \u0438\u043d\u043e\u0433\u0434\u0430 \u0432 \u043f\u0440\u043e\u0434\u0430\u0436\u0435, \u0438 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0430 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044f\u0445 \u0434\u043e 1200 \u0411\u043e\u0434. \u041d\u0430 \u043d\u0435\u0439 \u043f\u043e\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u043c\u043e\u0434\u0435\u043c \u0441 \u043d\u0443\u043b\u044f \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435, \u0447\u0435\u043c \u043d\u0430 \u0434\u0438\u0441\u043a\u0440\u0435\u0442\u043d\u044b\u0445 \u0442\u0440\u0430\u043d\u0437\u0438\u0441\u0442\u043e\u0440\u0430\u0445.<\/p>\n<p>Celkovo nem\u00e1 zmysel obnovova\u0165 tento dreven\u00fd modem, ale bolo ve\u013emi zauj\u00edmav\u00e9 ho rozobra\u0165, usporiada\u0165 fotenie a v\u0161etko zlo\u017ei\u0165 tak, ako to bolo. Takto vyzerala vo vn\u00fatri prakticky v\u0161etka elektronika, k\u00fdm nemala mikro\u010d\u00edny. Ale ak sa n\u00e1hodou autorovi dostane do r\u00fak vhodn\u00e9 zariadenie akustick\u00e9ho prepojenia k tomuto modemu, ur\u010dite si e\u0161te raz rozmysl\u00ed: a mo\u017eno by predsa len st\u00e1lo za to sa pusti\u0165 do opravy?<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/446114\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043b\u0435\u0442 \u043d\u0430\u0437\u0430\u0434 \u0430\u0432\u0442\u043e\u0440 \u043f\u043e\u0431\u044b\u0432\u0430\u043b \u043d\u0430 \u0431\u0430\u0440\u0430\u0445\u043e\u043b\u043a\u0435, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0439 W6TRW \u043d\u0430 \u0430\u0432\u0442\u043e\u0441\u0442\u043e\u044f\u043d\u043a\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Northrop Grumman \u0432 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